Display Device Intermediate Layer Disconnection for Leakage Current
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Solution Overview
Problem
Wearable display devices, such as head-mounted displays (HMDs) and augmented reality (AR) glasses, face challenges in maintaining high resolution without generating unintended leakage current between adjacent pixels, which leads to color crosstalk.
Innovation Solution
The implementation of a display device design where at least a portion of the intermediate layer between the pixel electrode and the common electrode is disconnected between adjacent pixels, preventing leakage current and color crosstalk. This is achieved through the use of a heating wiring that disconnects the intermediate layer, ensuring independent power supply to each pixel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the distance between pixels is reduced to increase resolution, then the display resolution is improved, but leakage current is generated between adjacent pixels causing color crosstalk
Solution Approach 1:
The intermediate layer is divided into pixel portions and disconnected portions, with the disconnected portions forming isolation regions between adjacent pixels. This segmentation prevents leakage current from traveling between pixels while maintaining high resolution by allowing pixel spacing to be reduced.
Solution Approach 2:
The disconnected portions of the intermediate layer act as intermediary isolation regions between adjacent pixels. These intermediate structures block the harmful leakage current while allowing the pixel distance to be minimized for high resolution display.
2Object-generated harmful factors
If the intermediate layer is disconnected between adjacent pixels to prevent leakage current, then color crosstalk is prevented, but the manufacturing process becomes more complex
Solution Approach 1:
The disconnected portions of the intermediate layer are formed simultaneously with the pixel defining layer in a single manufacturing process. This merging of formation steps prevents color crosstalk while avoiding additional manufacturing complexity.
Solution Approach 2:
The pixel defining layer serves multiple functions: it defines the pixel openings and simultaneously creates the disconnected portions that form isolation regions. This multi-functionality prevents color crosstalk without requiring separate manufacturing steps.
3Reliability
If heating wiring is added to disconnect the intermediate layer, then leakage current is prevented, but the device structure becomes more complex
Solution Approach 1:
The pixel defining layer automatically forms the disconnected portions that create isolation regions during the normal manufacturing process. This self-service approach prevents leakage current without requiring additional heating wiring or complex structural modifications.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution effectively prevents leakage current and color crosstalk, ensuring that wearable display devices can maintain high resolution and reduce user discomfort, such as dizziness, associated with these issues.
Implementation Method 1
a heating wiring disposed on the pixel defining layer around each opening
Data Source
AI summary
A display device includes a driving element layer on a substrate, a wiring layer on the driving element layer and including a power supply wiring, and a light emitting element layer disposed on the wiring layer. The light emitting element layer includes a pixel defining layer defining openings for pixels, a first electrode in each opening, a heating wiring on the pixel defining layer around each opening, a connection electrode connecting the heating wiring and the power supply wiring through a contact hole extending through the wiring layer and the pixel defining layer, an intermediate layer covering the first electrode in the pixels and the pixel defining layer between the pixels, and including a disconnected portion on the pixel defining layer adjacent to the heating wiring, and a second electrode continuously disposed on the intermediate layer in the openings for the pixels and between the pixels.